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Good luck Michael, I was new to 450, naza and gps with dx8 myself a few months ago. Read DX8 manuals, Naza and GPS manuals and with everyone's help, you should have no problems. There are also a lot of videos on youtube. TAKE YOUR TIME. You may also want to visit
http://www.rcgroups.com/forums/showthread.php?t=1536553. Lots of great information in this one thread, particularly the first one with great links about everything you need to know. (Sorry for reference to another forum, but many questions answered on first page of thread).
I also use different colored heat shrink (buy cheap at hobby king or any electronic supply store) to color code my switches for atti, manual, gps (BLACK); failafe (RED), home/course lock (Yellow) that way if my fingers fumble, i quickly can see the correct switches.
Failsafe is the trickiest and most important to set up. Note you have to set up Naza for failsafe and ALSO set up the DX8 for failsafe. See manuals and links.